Abstract: Objective To undergo classification and segment measurement of for patient cases with fracture injuries at tibia, fibula or ankle, and investigate fracture injury rules in half-squat parachuting landing. Methods 56 patient cases with fracture in parachuting landing were collected, and the tibiofibula and ankle fractures were classified according to AO-OTA or Lauge-Hansen classification standards respectively based on digital X-ray image. The plane between talus and tibia joint planes in ankle joint was defined as the reference plane. The location and length of fracture segment on tibia and fibula were measured. Results Patients with fracture of both tibia and fibula were 80.4% of all patients. The major classification for fracture of tibiofibula was 42-D/5.2 (45.8%) and 42-D/5.1 (16.7%). The major classification for fracture of ankle was pronation-external rotation (PER, 59.4%) and supination-external rotation (SER, 37.5%). The fracture segment of tibia was mainly from 57 to 143mm above the reference plane and from 6mm below the reference plane to 24mm above the reference plane, while the fracture segment of fibula from 4mm to 45mm and from 74mm to 83mm above the reference plane. Conclusions In the protection of lower limb in parachuting landing, the fracture occurred both on tibia and fibula should be highly noticed. The ankle motion of pronation-external rotation and supination-external rotation should be especially restricted in parachuting ankle protection. Emphasized protection should be performed on tibia in the segment from 57 to 143mm above the reference plane and from 6mm below the reference plane to 24mm above the reference plane and on fibula from 4mm to 45mm and from 74mm to 83mm above the reference plane.